@book { EntwicklungundGestaltderSakramententheologiebeiMartinLuther,
    title = "Entwicklung und Gestalt der Sakramententheologie bei Martin Luther",
    author = "Wolfgang {Schwab}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070086"
}